I Corinthians 7:14

sanctified--Those inseparably connected with the people of God are hallowed thereby, so that the latter may retain the connection without impairing their own sanctity (compare Ti1 4:5); nay, rather imparting to the former externally some degree of their own hallowed character, and so preparing the way for the unbeliever becoming at last sanctified inwardly by faith. by . . . by--rather, "in . . . in"; that is, in virtue of the marriage tie between them. by the husband--The oldest manuscripts read, "by the brother." It is the fact of the husband being a "brother," that is, a Christian, though the wife is not so, that sanctifies or hallows the union. else . . . children unclean--that is, beyond the hallowed pale of God's people: in contrast to "holy," that is, all that is within the consecrated limits [CONYBEARE and HOWSON]. The phraseology accords with that of the Jews, who regarded the heathen as "unclean," and all of the elect nation as "holy," that is, partakers of the holy covenant. Children were included in the covenant, as God made it not only with Abraham, but with his "seed after" him (Gen 17:7). So the faith of one Christian parent gives to the children a near relationship to the Church, just as if both parents were Christians (compare Rom 11:16). Timothy, the bearer of this Epistle, is an instance in point (Act 16:1). Paul appeals to the Corinthians as recognizing the principle, that the infants of heathen parents would not be admissible to Christian baptism, because there is no faith on the part of the parents; but where one parent is a believer, the children are regarded as not aliens from, but admissible even in infancy as sharers in, the Christian covenant: for the Church presumes that the believing parent will rear the child in the Christian faith. Infant…

In this chapter the apostle answers some cases proposed to him by the Corinthians about marriage. He, I. Shows them that marriage was appointed as a remedy against fornication, and therefore that persons had better marry than burn (Co1 7:1-9). II. He gives direction to those who are married to continue together, though they might have an unbelieving relative, unless the unbeliever would part, in which case a Christian would not be in bondage (Co1 7:10-16). III. He shows them that becoming Christians does not change their external state; and therefore advises every one to continue, in the general, in that state in which he was called (Co1 7:17-24). IV. He advises them, by reason of the present distress, to keep themselves unmarried; hints the shortness of time, and how they should improve it, so as to grow dead and indifferent to the comforts of the world; and shows them how worldly cares hinder their devotions, and distract them in the service of God (Co1 7:25-35). V. He directs them in the disposal of their virgins (Co1 7:36-38). VI. And closes the chapter with advice to widows how to dispose of themselves in that state (Co1 7:39, Co1 7:40).

7:14 By remaining committed to the marriage, the Christian brings holiness to the unbelieving spouse. Such holiness extends to the children, who also benefit from the holiness of a Christian parent (cp. Mal 2:15).